Andrey V. Elsukov 1875bbfe54 Implement "global" mode for ipfw nat. It is similar to natd(8)
"globalport" option for multiple NAT instances.

If ipfw rule contains "global" keyword instead of nat_number, then
for each outgoing packet ipfw_nat looks up translation state in all
configured nat instances. If an entry is found, packet aliased
according to that entry, otherwise packet is passed unchanged.

User can specify "skip_global" option in NAT configuration to exclude
an instance from the lookup in global mode.

PR:		kern/157867
Submitted by:	Alexander V. Chernikov (previous version)
Tested by:	Eugene Grosbein
2011-06-14 13:35:24 +00:00
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